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* gnu-v3-abi.c (vtable_ptrdiff_type): New function.

Browse Source 
(gnuv3_decode_method_ptr, gnuv3_print_method_ptr)
	(gnuv3_method_ptr_to_value): Use a better approximation for
	`ptrdiff_t' instead of `long'.

	* m32c-tdep.c (m32c_gdbarch_init): Call set_gdbarch_vbit_in_delta().
	(m32c_push_dummy_call): Dereference pointer type.
This commit is contained in:
Kevin Buettner 2008-12-13 00:39:53 +00:00
parent 36dcf92c3e
commit ed09d7da47
3 changed files with 39 additions and 3 deletions
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12
gdb/ChangeLog
View File

@ -1,3 +1,15 @@
2008-12-12 Kevin Buettner <kevinb@redhat.com>
* gnu-v3-abi.c (vtable_ptrdiff_type): New function.
(gnuv3_decode_method_ptr, gnuv3_print_method_ptr)
(gnuv3_method_ptr_to_value): Use a better approximation for
`ptrdiff_t' instead of `long'.
2008-12-12 Kevin Buettner <kevinb@redhat.com>
* m32c-tdep.c (m32c_gdbarch_init): Call set_gdbarch_vbit_in_delta().
(m32c_push_dummy_call): Dereference pointer type.
2008-12-12 Tom Tromey <tromey@redhat.com>
PR cli/2563:

16
gdb/gnu-v3-abi.c
View File

@ -187,6 +187,16 @@ build_gdb_vtable_type (struct gdbarch *arch)
}
/* Return the ptrdiff_t type used in the vtable type. */
static struct type *
vtable_ptrdiff_type (struct gdbarch *gdbarch)
{
struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
/* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */
return TYPE_FIELD_TYPE (vtable_type, vtable_field_offset_to_top);
}
/* Return the offset from the start of the imaginary `struct
gdb_gnu_v3_abi_vtable' object to the vtable's "address point"
(i.e., where objects' virtual table pointers point). */
@ -531,7 +541,7 @@ gnuv3_decode_method_ptr (struct gdbarch *gdbarch,
LONGEST *adjustment_p)
{
struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr;
struct type *offset_type = builtin_type (gdbarch)->builtin_long;
struct type *offset_type = vtable_ptrdiff_type (gdbarch);
CORE_ADDR ptr_value;
LONGEST voffset, adjustment;
int vbit;
@ -595,7 +605,7 @@ gnuv3_print_method_ptr (const gdb_byte *contents,
/* It's a virtual table offset, maybe in this class. Search
for a field with the correct vtable offset. First convert it
to an index, as used in TYPE_FN_FIELD_VOFFSET. */
voffset = ptr_value / TYPE_LENGTH (builtin_type (gdbarch)->builtin_long);
voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch));
physname = gnuv3_find_method_in (domain, voffset, adjustment);
@ -722,7 +732,7 @@ gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr)
if (vbit)
{
LONGEST voffset;
voffset = ptr_value / TYPE_LENGTH (builtin_type (gdbarch)->builtin_long);
voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch));
return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p),
method_type, voffset);
}

14
gdb/m32c-tdep.c
View File

@ -2018,6 +2018,10 @@ m32c_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
{
struct type *func_type = value_type (function);
/* Dereference function pointer types. */
if (TYPE_CODE (func_type) == TYPE_CODE_PTR)
func_type = TYPE_TARGET_TYPE (func_type);
gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC ||
TYPE_CODE (func_type) == TYPE_CODE_METHOD);
@ -2596,6 +2600,16 @@ m32c_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_virtual_frame_pointer (arch, m32c_virtual_frame_pointer);
/* m32c function boundary addresses are not necessarily even.
Therefore, the `vbit', which indicates a pointer to a virtual
member function, is stored in the delta field, rather than as
the low bit of a function pointer address.
In order to verify this, see the definition of
TARGET_PTRMEMFUNC_VBIT_LOCATION in gcc/defaults.h along with the
definition of FUNCTION_BOUNDARY in gcc/config/m32c/m32c.h. */
set_gdbarch_vbit_in_delta (arch, 1);
return arch;
}